A fixed mass of gas is trapped in a rigid container. The temperature of the gas is decreased while the volume of the gas is kept constant. How does this change affect the average kinetic energy of the molecules and the pressure exerted on the walls of the container?
Average kinetic energy decreases, pressure decreases
Average kinetic energy stays the same, pressure decreases
Average kinetic energy decreases, pressure increases
Average kinetic energy stays the same, pressure increases
321 exam-style questions on CIE IGCSE Physics 2.1 Kinetic particle model of matter, covering 2.1.1 States of matter and changes of state, 2.1.2a Particle structure and motion in solids, liquids and gases, 2.1.2b Gas pressure and particle collisions, 2.1.2c Brownian motion, 2.1.3a The absolute scale of temperature, and 2.1.3b Pressure, volume and temperature of a gas. Each one has a worked solution and a mark scheme showing where the marks go.